SLEEP SCIENCE

How to Lower Cortisol Naturally for Better Sleep: Foods, Melatonin-Rich Snacks and Easy Home Exercises

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Cortisol is your main stress hormone. It is made by your adrenal glands and it is not the enemy: it helps control blood sugar, metabolism, blood pressure and your immune response, and it gives you the push to get out of bed in the morning.

The problem starts when cortisol stays high for too long. Chronic stress can keep it elevated, and that can show up as poor sleep, waking at 3 a.m., cravings, belly weight gain, low energy and feeling “wired but tired”. The good news: simple daily habits can bring it back into a healthier rhythm. This guide keeps it practical.

Quick answer

To lower high cortisol naturally: keep a regular sleep schedule, get morning daylight, eat balanced, low-sugar meals with protein and fibre, drink enough water, limit caffeine after noon and alcohol at night, take a 20 to 30 minute walk most days, and practise slow breathing. Ashwagandha has the strongest research of any herb for lowering cortisol, but check with your doctor first.

Table of Contents

Signs your cortisol may be too high

There is no single symptom, but common signs of long-term stress and high cortisol include:

Trouble falling asleep, or waking between 2 and 4 a.m.
Feeling tired in the morning but alert at night
Sugar and salt cravings
Weight gain around the stomach
Anxiety, irritability or low mood
Getting sick more often

These signs overlap with many other problems, so they are a reason to look at your lifestyle, not a diagnosis. A doctor can test cortisol with blood, saliva or urine tests if needed.

1. Fix your sleep rhythm first

Cortisol follows a daily curve. It peaks shortly after you wake up and falls to its lowest point around bedtime, which is when melatonin, your sleep hormone, rises. Short or irregular sleep disrupts this curve: in a classic study, cutting sleep raised cortisol levels the next evening, exactly when they should be low.

Same bedtime and wake time every day, including weekends, keeps your cortisol and melatonin curves in step.
Get outdoor light within 30 to 60 minutes of waking. Even 10 minutes on a balcony or a short walk helps anchor your morning cortisol peak so it falls properly at night.
Dim screens and bright lights 1 to 2 hours before bed. Bright and blue light in the evening delays melatonin release.
Keep the bedroom cool, dark and quiet. See our guide on why you get hot when you sleep.

Want a step-by-step plan? The 14-Day Sleep Reset walks you through resetting your sleep rhythm one night at a time, with simple routines for evenings, mornings and stressful days.

Get the 14-Day Sleep Reset Guide →

2. Foods that help lower cortisol

No single food “flushes out” cortisol. What helps is a steady eating pattern that avoids big blood sugar swings, because sharp crashes trigger cortisol release to bring blood sugar back up. Build most meals around:

Protein at every meal: eggs, fish, chicken, lentils, beans, Greek yoghurt.
Complex carbs and fibre: oats, brown rice, whole grains, vegetables and legumes release energy slowly.
Omega-3 fats: salmon, sardines, mackerel, walnuts and flaxseed support a healthier stress response.
Magnesium-rich foods: leafy greens, pumpkin seeds, almonds, beans and dark chocolate (70% or more, a small square).
Fermented foods: yoghurt, kefir and kimchi support the gut, which is closely linked to stress and mood.
Green tea: contains L-theanine, an amino acid linked to calm alertness. Choose decaf in the evening.

Limit: sugary snacks and drinks, refined white flour, heavy caffeine (especially on an empty stomach or after midday) and alcohol at night, which fragments sleep. Also avoid crash dieting: eating far too little is itself a stress signal that can push cortisol up.

Drink enough water. A 2025 study from Liverpool John Moores University found that people who habitually drank too little had a bigger cortisol spike during a stressful task than people who were well hydrated.

3. Fruits and foods that contain melatonin

Some plants and foods naturally contain small amounts of melatonin. Researchers have measured it in nanograms per gram (ng/g). Here is what studies have found in some of the best-known sources:

Food	Melatonin measured	Notes
Tart cherries (Montmorency)	about 13.5 ng/g	Balaton variety: about 2 ng/g
Oats	about 90 ng/g	Reported in fresh oat samples
Rice	average 16 ng/g	Range 0 to 264 ng/g across 25 varieties; coloured rice tends to be higher
Tomatoes	up to about 15 to 24 ng/g	Varies a lot by variety and ripeness
Strawberries	about 11 ng/g	Festival variety
Walnuts	about 3.5 ng/g	Also a good source of omega-3 fats
Grapes (skin)	about 9 to 159 ng/g (dry weight)	Depends on variety and growing conditions
Mushrooms (button)	4,300 to 6,400 ng/g (dry weight)	Fresh mushrooms contain far less because they are mostly water
Milk	higher at night	Milk collected at night has roughly ten times more than daytime milk

Values come from laboratory studies summarised in a 2017 review in the journal Nutrients and from earlier research on tart cherries and walnuts. Results vary widely between varieties, growing conditions and testing methods. One study reported extremely high levels in pistachios, but this has not been confirmed, so treat it with caution.

Keep it in perspective: 100 g of tart cherries contains roughly 1.3 micrograms of melatonin, while a typical melatonin supplement contains 500 to 5,000 micrograms. So foods will not act like a sleeping pill. Still, small studies suggest certain foods may help:

Tart cherry juice: in a 2012 study, drinking tart cherry concentrate for 7 days raised melatonin levels and improved total sleep time and sleep efficiency.
Kiwi: in a small 2011 study, adults who ate two kiwis one hour before bed fell asleep faster and slept longer over four weeks.
Walnuts, oats and milk make an easy, calming evening snack: try a small bowl of oats with warm milk and a few walnuts, or tart cherries with yoghurt.

Bananas, pineapple and oranges are often mentioned too. Studies found they can raise melatonin levels in the blood after eating, even though their own melatonin content is low.

4. Simple home exercises that lower stress

Moderate movement is one of the best ways to bring stress hormones down. Very long or very intense workouts raise cortisol for a while, which is fine when you are well rested but not ideal when you are already burned out. When stress is high, choose gentle and steady.

Brisk walking, 20 to 30 minutes

A 2019 study in Frontiers in Psychology found that just 20 to 30 minutes of sitting or walking in a place that feels like nature brought the biggest drop in cortisol. A park, a tree-lined street or a rooftop garden all count. No outdoor space? A brisk indoor walk, marching on the spot or walking up and down stairs still helps.

Gentle yoga and stretching, 10 minutes

Try this easy evening routine, holding each pose for 5 slow breaths:

Cat-cow on hands and knees to loosen the spine
Child’s pose to relax the back and shoulders
Seated forward fold to stretch the hamstrings
Legs up the wall for 3 to 5 minutes to calm the body before bed

Easy bodyweight circuit, 15 minutes

At a comfortable pace, do 10 squats, 10 wall or knee push-ups, 10 glute bridges and a 30-second plank. Rest a minute and repeat 2 to 3 times. Do this earlier in the day rather than right before bed.

Breathing: the “cyclic sigh”, 5 minutes

Breathe in through the nose, take a second short sip of air to fully fill the lungs, then exhale slowly through the mouth for as long as is comfortable. In a 2023 Stanford study, 5 minutes a day of this practice improved mood and lowered breathing rate more than mindfulness meditation. It is a great tool to use in bed if your mind is racing.

5. Daily stress habits that add up

Meditation or quiet time, 10 minutes a day, even just sitting with slow breathing.
Laugh and connect. Time with friends, family or a pet helps buffer stress.
Write tomorrow’s to-do list before bed so worries do not follow you to the pillow.
Take short breaks from screens and news during the day.

6. Ashwagandha: the most studied herb for cortisol

Ashwagandha (Withania somnifera) is an adaptogen used for centuries in Ayurvedic medicine. It has more human research on stress and cortisol than any other herbal supplement:

In a 60-day randomized controlled trial of 64 adults with chronic stress, those taking 300 mg of a full-spectrum root extract twice a day had significantly lower serum cortisol and lower stress scores than the placebo group (Chandrasekhar, 2012).
In a 2019 trial in stressed but healthy adults, 240 mg a day of an ashwagandha extract for 60 days lowered morning cortisol and reduced anxiety compared with placebo (Lopresti, 2019).
The US National Center for Complementary and Integrative Health says some ashwagandha preparations may help with stress and insomnia, but many studies are small.

HOW TO CHOOSE AN ASHWAGANDHA SUPPLEMENT

Choose a standardized root extract such as KSM-66 or Sensoril, the types used in many studies.
Studies used about 240 to 600 mg a day, usually for 8 weeks. Follow the label and your doctor’s advice.
Look for third-party testing (such as USP, NSF or Informed Choice) for purity.
Many people take it in the evening because it may also support sleep.

Safety first

Ashwagandha may be safe for short-term use (up to about 3 months). Possible side effects include drowsiness, stomach upset and diarrhoea, and rare cases of liver injury have been reported. Avoid it if you are pregnant or breastfeeding, have a thyroid or autoimmune condition, have hormone-sensitive prostate cancer or are having surgery. It can interact with medicines for diabetes, thyroid, seizures and the immune system.

Other supplements with some evidence: magnesium (glycinate is often taken in the evening; see our magnesium guide), L-theanine from green tea, and omega-3 fish oil. Supplements work best on top of good sleep, food and movement, not instead of them.

When to see a doctor

Lifestyle changes help most people with stress-related cortisol. But very high cortisol can be caused by a medical condition such as Cushing’s syndrome or by long-term steroid medicines. See a doctor if you notice fast weight gain in the face, upper back or stomach, wide purple stretch marks, easy bruising, muscle weakness or high blood pressure, or if stress, anxiety or insomnia is affecting your daily life.

Ready to sleep better in two weeks? Lower stress and better sleep go hand in hand. The 14-Day Sleep Reset gives you a simple, night-by-night plan to calm your evenings, fall asleep faster and wake up refreshed.

Get the 14-Day Sleep Reset Guide →

Keep reading

Frequently asked questions

What is the fastest way to lower cortisol?

Slow breathing with long exhales, a 20 to 30 minute walk outdoors, and stepping away from the stressor can lower stress quickly. Long-term, regular sleep, balanced meals and exercise matter most.

What foods lower cortisol at night?

A light evening snack with protein and complex carbs, such as oats with milk and walnuts, yoghurt with tart cherries or a couple of kiwis, can support calm and sleep. Avoid sugar, caffeine and alcohol late in the day.

Which food has the most melatonin?

Studies have measured relatively high levels in some mushrooms (dried), oats, certain rice varieties, tart cherries and grape skins. Amounts are still far lower than in melatonin supplements.

How long does ashwagandha take to lower cortisol?

Most studies measured results after about 8 weeks (60 days) of daily use. Talk to your doctor before starting, especially if you take medicines.

Does walking really lower cortisol?

Yes. Moderate exercise like brisk walking helps regulate stress hormones, and a 2019 study found 20 to 30 minutes in a nature-like setting brought the largest drop in cortisol.

References

This article is for general information only and is not medical advice. See our Medical Disclaimer.